Володя

MODx.config.default_media_source

MODx.config.ms2_product_source_default

Стилизовать xtype: 'modx-combo-browser'

MODx.combo.Browser = function(config) {
    config = config || {};
    Ext.applyIf(config,{
       width: 400
       ,triggerAction: 'all'
       ,triggerClass: 'x-form-file-trigger'
       ,source: config.source || MODx.config.default_media_source
    });
    MODx.combo.Browser.superclass.constructor.call(this,config);
    this.config = config;
};
Ext.extend(MODx.combo.Browser,Ext.form.TriggerField,{
    browser: null

    ,onTriggerClick : function(btn){
        if (this.disabled){
            return false;
        }

        //if (this.browser === null) {
            this.browser = MODx.load({
                xtype: 'modx-browser'
                ,closeAction: 'close'
                ,id: Ext.id()
                ,multiple: true
                ,source: this.config.source || MODx.config.default_media_source
                ,hideFiles: this.config.hideFiles || false
                ,rootVisible: this.config.rootVisible || false
                ,allowedFileTypes: this.config.allowedFileTypes || ''
                ,wctx: this.config.wctx || 'web'
                ,openTo: this.config.openTo || ''
                ,rootId: this.config.rootId || '/'
                ,hideSourceCombo: this.config.hideSourceCombo || false
                ,listeners: {
                    'select': {fn: function(data) {
                        this.setValue(data.relativeUrl);
                        this.fireEvent('select',data);
                    },scope:this}
                }
            });
        //}
        this.browser.show(btn);
        return true;
    }

    ,onDestroy: function(){
        MODx.combo.Browser.superclass.onDestroy.call(this);
    }
});
Ext.reg('modx-combo-browser',MODx.combo.Browser);

xtype: 'button',
handler: function () {
    // генерируем 
}

И как в вызове указать несколько параметров сниппета?

<a class="quickview"
		   data-mouseover
		   data-quickview-mode="modal"
		   data-data-element="test"
		   data-data-id="1"
		   data-dialog-buttons='[ { "action":"close","label":"закрыть","title":"закрыть","cls":"tm-close" } ]'
		>наведите</a>

$miniShop2->cart->add(5,1, $options);

Check URL - https://site.ru/assets/components/mspyacassa/controllers/minishop2.php
Aviso URL - https://site.ru/assets/components/mspyacassa/controllers/minishop2.php